OTHER ANSWERS

In testing the site I am seeing load times in the 3 second range. While not super fast, it is not too slow. What timeframes are you seeing when visiting the site?

Also, I see you are on a VPS. What type of changes, if any, have you made recently?

Lastly, you may want to have your developer check your site on a third party efficiency evaluation tool, such as GTMetrix.com. This can be very helpful for finding areas of improvement to speed up your site. I have included the tools evaluation of your site here for reference.

If you have any more questions or information specific to the issue please leave a comment below so we can further assist you.